{"instruction": "You are an expert in named entity recognition. Please extract entities that match the schema definition from the input. Return an empty list if the entity type does not exist. Please respond in the format of a JSON string.", "schema": ["Disease"], "input": "BACKGROUND & AIMS The chromosome region 18q21 has been shown to be frequently deleted in colorectal cancers , and such frequent allelic loss is a hallmark of the presence of a tumor - suppressor gene ."}
{"Disease": ["colorectal cancers"]}